This feature allows analyses to be customized for each data file to be
analyzed without having to create a new script for each file.
Parameters can be looked up by the 'infile' name (without the path).
The syntax is:

Which will cause the value of pname to be taken from the record
in filename which begins with the input file name ('infile'). The
data file must be of the form:

n m
fname_1 ... fname_m
d_1_1 ... d_1_m
...
d_n_1 ... d_n_m

Where n is the number of records, m the number of
fields, fname refers to field names and d refers to the
data values for all fields of all records.

Look-up conditions

These work like look-up parameters, but have a more elaborate and
general format. The syntax is:

lookup <filename> <cstr> <astr> | <[fstr]> ...

where, filename is the name of the file that contains the
lookup table, cstr is any condition specifier, astr is
any string, and fstr is any field name in the look-up table
enclosed in square brackets, []. Note, any part of the above
expression, except for the first two items, can be inside []'s and
will be looked up and replaced. For example, the following line

lookup table.txt param_range contrast [c_low] [c_high]

would cause the values for c_low and c_high in the file
table.txt to be substituted for the bracketed expressions.